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/*
 * Copyright (c) 2019-2029, Dreamlu 卢春梦 ([email protected] & dreamlu.net).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.dreamlu.iot.mqtt.spring.server.config;

import net.dreamlu.iot.mqtt.core.server.MqttServer;
import net.dreamlu.iot.mqtt.core.server.MqttServerCreator;
import net.dreamlu.iot.mqtt.core.server.auth.IMqttServerAuthHandler;
import net.dreamlu.iot.mqtt.core.server.auth.IMqttServerPublishPermission;
import net.dreamlu.iot.mqtt.core.server.auth.IMqttServerSubscribeValidator;
import net.dreamlu.iot.mqtt.core.server.auth.IMqttServerUniqueIdService;
import net.dreamlu.iot.mqtt.core.server.dispatcher.IMqttMessageDispatcher;
import net.dreamlu.iot.mqtt.core.server.event.IMqttConnectStatusListener;
import net.dreamlu.iot.mqtt.core.server.event.IMqttMessageListener;
import net.dreamlu.iot.mqtt.core.server.event.IMqttSessionListener;
import net.dreamlu.iot.mqtt.core.server.interceptor.IMqttMessageInterceptor;
import net.dreamlu.iot.mqtt.core.server.session.IMqttSessionManager;
import net.dreamlu.iot.mqtt.core.server.store.IMqttMessageStore;
import net.dreamlu.iot.mqtt.core.server.support.DefaultMqttServerAuthHandler;
import net.dreamlu.iot.mqtt.spring.server.MqttServerCustomizer;
import net.dreamlu.iot.mqtt.spring.server.MqttServerTemplate;
import net.dreamlu.iot.mqtt.spring.server.event.SpringEventMqttConnectStatusListener;
import net.dreamlu.iot.mqtt.spring.server.event.SpringEventMqttMessageListener;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.tio.core.ssl.SSLEngineCustomizer;
import org.tio.core.ssl.SslConfig;

/**
 * mqtt server 配置
 *
 * @author L.cm
 */
@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(
	prefix = MqttServerProperties.PREFIX,
	name = "enabled",
	havingValue = "true",
	matchIfMissing = true
)
@EnableConfigurationProperties(MqttServerProperties.class)
public class MqttServerConfiguration {

	@Bean
	@ConditionalOnMissingBean
	public IMqttConnectStatusListener springEventMqttConnectStatusListener(ApplicationEventPublisher eventPublisher) {
		return new SpringEventMqttConnectStatusListener(eventPublisher);
	}

	@Bean
	@ConditionalOnMissingBean
	public IMqttMessageListener springEventMqttMessageListener(ApplicationEventPublisher eventPublisher) {
		return new SpringEventMqttMessageListener(eventPublisher);
	}

	@Bean
	public MqttServerCreator mqttServerCreator(MqttServerProperties properties,
											   ObjectProvider authHandlerObjectProvider,
											   ObjectProvider uniqueIdServiceObjectProvider,
											   ObjectProvider subscribeValidatorObjectProvider,
											   ObjectProvider publishPermissionObjectProvider,
											   ObjectProvider messageDispatcherObjectProvider,
											   ObjectProvider messageStoreObjectProvider,
											   ObjectProvider sessionManagerObjectProvider,
											   ObjectProvider sessionListenerObjectProvider,
											   ObjectProvider messageListenerObjectProvider,
											   ObjectProvider connectStatusListenerObjectProvider,
											   ObjectProvider messageInterceptorObjectProvider,
											   ObjectProvider sslCustomizers,
											   ObjectProvider customizers) {
		MqttServerCreator serverCreator = MqttServer.create()
			.name(properties.getName())
			.ip(properties.getIp())
			.port(properties.getPort())
			.heartbeatTimeout(properties.getHeartbeatTimeout())
			.keepaliveBackoff(properties.getKeepaliveBackoff())
			.readBufferSize((int) properties.getReadBufferSize().toBytes())
			.maxBytesInMessage((int) properties.getMaxBytesInMessage().toBytes())
			.bufferAllocator(properties.getBufferAllocator())
			.maxClientIdLength(properties.getMaxClientIdLength())
			.webPort(properties.getWebPort())
			.websocketEnable(properties.isWebsocketEnable())
			.httpEnable(properties.isHttpEnable())
			.nodeName(properties.getNodeName())
			.statEnable(properties.isStatEnable());
		if (properties.isDebug()) {
			serverCreator.debug();
		}

		// http 认证
		MqttServerProperties.HttpBasicAuth httpBasicAuth = properties.getHttpBasicAuth();
		if (serverCreator.isHttpEnable() && httpBasicAuth.isEnable()) {
			serverCreator.httpBasicAuth(httpBasicAuth.getUsername(), httpBasicAuth.getPassword());
		}
		MqttServerProperties.Ssl ssl = properties.getSsl();
		// ssl 配置
		if (ssl.isEnabled()) {
			SslConfig sslConfig = SslConfig.forServer(ssl.getKeystorePath(), ssl.getKeystorePass(), ssl.getTruststorePath(), ssl.getTruststorePass(), ssl.getClientAuth());
			serverCreator.sslConfig(sslConfig);
			sslCustomizers.ifAvailable(sslConfig::setSslEngineCustomizer);
		}
		// 自定义消息监听
		messageListenerObjectProvider.ifAvailable(serverCreator::messageListener);
		// 认证处理器
		IMqttServerAuthHandler authHandler = authHandlerObjectProvider.getIfAvailable(() -> {
			MqttServerProperties.MqttAuth mqttAuth = properties.getAuth();
			return mqttAuth.isEnable() ? new DefaultMqttServerAuthHandler(mqttAuth.getUsername(), mqttAuth.getPassword()) : null;
		});
		serverCreator.authHandler(authHandler);
		// mqtt 内唯一id
		uniqueIdServiceObjectProvider.ifAvailable(serverCreator::uniqueIdService);
		// 订阅校验
		subscribeValidatorObjectProvider.ifAvailable(serverCreator::subscribeValidator);
		// 订阅权限校验
		publishPermissionObjectProvider.ifAvailable(serverCreator::publishPermission);
		// 消息转发
		messageDispatcherObjectProvider.ifAvailable(serverCreator::messageDispatcher);
		// 消息存储
		messageStoreObjectProvider.ifAvailable(serverCreator::messageStore);
		// session 管理
		sessionManagerObjectProvider.ifAvailable(serverCreator::sessionManager);
		// session 监听
		sessionListenerObjectProvider.ifAvailable(serverCreator::sessionListener);
		// 状态监听
		connectStatusListenerObjectProvider.ifAvailable(serverCreator::connectStatusListener);
		// 消息监听器
		messageInterceptorObjectProvider.orderedStream().forEach(serverCreator::addInterceptor);
		// 自定义处理
		customizers.ifAvailable((customizer) -> customizer.customize(serverCreator));
		return serverCreator;
	}

	@Bean
	public MqttServer mqttServer(MqttServerCreator mqttServerCreator) {
		return mqttServerCreator.build();
	}

	@Bean
	public MqttServerLauncher mqttServerLauncher(MqttServer mqttServer) {
		return new MqttServerLauncher(mqttServer);
	}

	@Bean
	public MqttServerTemplate mqttServerTemplate(MqttServer mqttServer) {
		return new MqttServerTemplate(mqttServer);
	}

}